Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
		Nov. 30, 2020	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating Revenue				$ 17,174	$ 13,964	$ 14,172
Depreciation, depletion and amortization				2,830	2,478	2,332
Equity in earnings of equity method investees				299	276	40
Interest income (expense)				117	101	107
Interest and related charges (benefit)				966	1,354	1,377
Income tax expense (benefit)		$ 336	$ 173	68	425	83
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interest	[1],[2]			9	641	(1,878)
Net income (loss) attributable to Dominion Energy				994	3,288	(401)
Investment in equity method affiliates	[3]		2,932	3,012	2,932
Capital expenditures				7,758	6,061	6,331
Total assets			99,590	104,243	99,590
Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue				17,174	13,959	14,197
Adjustments & Eliminations
Segment Reporting Information [Line Items]
Operating Revenue				0	60	48
Depreciation, depletion and amortization				0	0	0
Equity in earnings of equity method investees				0	0	0
Interest income (expense)				(76)	(26)	(88)
Interest and related charges (benefit)				(76)	(26)	(88)
Income tax expense (benefit)				0	0	0
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interest				0	0	0
Net income (loss) attributable to Dominion Energy				0	0	0
Investment in equity method affiliates	[3]		0	0	0
Capital expenditures				0	0	0
Total assets			(5,000)	(5,800)	(5,000)
Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue				0	5	(25)
Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue				(939)	(1,004)	(1,039)
Eliminations
Segment Reporting Information [Line Items]
Operating Revenue				(939)	(944)	(991)
Dominion Energy Virginia
Segment Reporting Information [Line Items]
Operating Revenue				9,653	7,999	7,787
Dominion Energy Virginia | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue				9,666	8,012	7,802
Depreciation, depletion and amortization				1,454	1,299	1,247
Equity in earnings of equity method investees				0	0	0
Interest income (expense)				17	13	13
Interest and related charges (benefit)				647	537	527
Income tax expense (benefit)				408	462	496
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interest				0	0	0
Net income (loss) attributable to Dominion Energy				2,008	1,919	1,891
Investment in equity method affiliates	[3]		0	0	0
Capital expenditures				5,206	3,762	3,406
Total assets			50,300	55,400	50,300
Dominion Energy Virginia | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue				(13)	(13)	(15)
Gas Distribution
Segment Reporting Information [Line Items]
Operating Revenue				3,333	2,665	2,355
Gas Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue				3,331	2,660	2,345
Depreciation, depletion and amortization				384	380	344
Equity in earnings of equity method investees				3	0	0
Interest income (expense)				9	6	6
Interest and related charges (benefit)				119	86	76
Income tax expense (benefit)				146	116	121
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interest				0	0	0
Net income (loss) attributable to Dominion Energy				697	600	560
Investment in equity method affiliates	[3]		106	146	106
Capital expenditures				1,458	1,252	1,151
Total assets			18,500	19,600	18,500
Gas Distribution | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue				2	5	10
Dominion Energy South Carolina
Segment Reporting Information [Line Items]
Operating Revenue				3,330	2,975	2,787
Dominion Energy South Carolina | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue				3,323	2,968	2,782
Depreciation, depletion and amortization				507	486	474
Equity in earnings of equity method investees				0	(3)	(1)
Interest income (expense)				6	10	12
Interest and related charges (benefit)				220	206	219
Income tax expense (benefit)				132	125	107
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interest				0	0	0
Net income (loss) attributable to Dominion Energy				505	437	419
Investment in equity method affiliates	[3]		0	0	0
Capital expenditures				708	694	700
Total assets			16,400	17,200	16,400
Dominion Energy South Carolina | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue				7	7	5
Contracted Assets
Segment Reporting Information [Line Items]
Operating Revenue				908	1,085	1,071
Contracted Assets | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue				890	1,018	1,020
Depreciation, depletion and amortization				123	162	182
Equity in earnings of equity method investees				277	259	35
Interest income (expense)				75	81	91
Interest and related charges (benefit)				95	52	75
Income tax expense (benefit)				106	112	(16)
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interest				0	0	167
Net income (loss) attributable to Dominion Energy				335	431	402
Investment in equity method affiliates	[3]		2,738	2,673	2,738
Capital expenditures				342	277	649
Total assets			12,300	9,700	12,300
Contracted Assets | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue				18	67	51
Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenue				889	184	1,163
Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue				(36)	(759)	200
Depreciation, depletion and amortization				362	151	85
Equity in earnings of equity method investees				19	20	6
Interest income (expense)				86	17	73
Interest and related charges (benefit)				(39)	499	568
Income tax expense (benefit)				(724)	(390)	(625)
Net Income (Loss) From Discontinued Operations Including Noncontrolling Interest				9	641	(2,045)
Net income (loss) attributable to Dominion Energy				(2,551)	(99)	(3,673)
Investment in equity method affiliates	[3]		88	193	88
Capital expenditures				44	76	425
Total assets			$ 7,100	8,100	7,100
Corporate and Other | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue				$ 925	$ 943	$ 963

[1] Includes income tax expense (benefit) of $8 million, $188 million and $(204) million for the years ended December 31, 2022, 2021 and 2020, respectively.

[2] See Note 9 for amounts attributable to related parties.

[3] Excludes liability to Atlantic Coast Pipeline.